Guys thanks for the info. A guy sent me this, is this correct? I have no idea when it comes to a S/C.
Get a turbo blow off valve and fit it between the carb and the supercharger, convecting the vacuum line to the intake manifold. This would be critical, otherwise the pressure produced when the supercharger is producing boost would blow apart the carb (massive pressure spike), when the throttle is closed after reving the engine. It would sound real cool too!
the fuel consumption doesn't bother me as you will see my car is a V8 VW Kombi.